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 $B4/180:   RS232 Write bit count/Tape Read timing Flag

Kernal-Reference:

 DEC $B4     : <A HREF="ROMEEBB.HTM">$EECD</A> <A HREF="ROMEEBB.HTM">$EEE7</A> <A HREF="ROMEEBB.HTM">$EEEE</A>
 INC $B4     : <A HREF="ROMEEBB.HTM">$EEF2</A> <A HREF="ROMEEBB.HTM">$EF00</A>
 LDA $B4     : <A HREF="ROMEEBB.HTM">$EEBB</A> <A HREF="ROMF92C.HTM">$F98B</A> <A HREF="ROMF92C.HTM">$F9AC</A> <A HREF="ROMF92C.HTM">$F9FC</A> <A HREF="ROMF92C.HTM">$FA14</A> <A HREF="ROMF92C.HTM">$FA2F</A>
 STA $B4     : <A HREF="ROMF841.HTM">$F854</A> <A HREF="ROMF92C.HTM">$FA42</A> <A HREF="ROMF92C.HTM">$FA4C</A>
 STX $B4     : <A HREF="ROMEF06.HTM">$EF1C</A>

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